WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
Connect the relay (1) to the wire harness connector (2).
Install any connector position assurance (CPA) devices or secondary locks.
Install the relay using any fasteners or tape that originally held the relay in place.